Integrate Unity Library with Expo Framework

# Install yarn
npm install -g yarn
 
# Install git LFS
brew install git-lfs
 
# Create project demo
yarn create expo-app --template default@sdk-51

cd "<REACT-NATIVE-ROOT-FOLDER>"
 
# Install lib react-native-unity-plugin
yarn add "react-native-unity-plugin@git+https://gitlab.com/educationxrmhmp-group/expo-unity.git#1.0.11-release.2"
 
# Install lib expo-build-properties for gradle.properties configuration
yarn add expo-build-properties

{
  "expo": {
    "plugins": [
      "react-native-unity-plugin",
      [
        "expo-build-properties",
        {
          "android": {
            "minSdkVersion": 26
          }
        }
      ]
    ],
    "ios": {
      "infoPlist": {
        "NSCameraUsageDescription":
          "Allow Expo experiences to use your camera",
        "NSLocationWhenInUseUsageDescription":
          "Allow Expo experiences to use your location",
        "NSMicrophoneUsageDescription":
          "Allow Expo experiences to access your microphone",
        "NSMotionUsageDescription":
          "Allow Expo experiences to access your device's accelerometer",
        "NSPhotoLibraryAddUsageDescription":
          "Give Expo experiences permission to save photos",
        "NSPhotoLibraryUsageDescription":
          "Give Expo experiences permission to access your photos"
      }
    }
  }
}

npx expo prebuild

import UnityView from 'react-native-unity-plugin'
import { useRef, useCallback, useEffect } from 'react'
import { View, AppState, AppStateStatus } from 'react-native';
import { useFocusEffect } from '@react-navigation/native';
import { useRouter } from 'expo-router';
 
 
const Unity = () => {
    const unityRef = useRef()
    const appState = useRef(AppState.currentState);
    const router = useRouter();
    useEffect(() => {
        if (unityRef.current) {
            // message set scene
            let message = JSON.stringify({
                type: "setPlatformType",
                message: "reactNative"
            })
 
            const handleAppStateChange = (nextAppState: AppStateStatus) => {
                if (
                    appState.current.match(/active/) &&
                    nextAppState.match(/inactive|background/)
                ) {
                    console.log("Pausing Unity");
                    // @ts-ignore
                    unityRef.current.pauseUnity?.(true);
                }
 
                if (
                    appState.current.match(/inactive|background/) &&
                    nextAppState === "active"
                ) {
                    console.log("Resuming Unity");
                    // @ts-ignore
                    unityRef.current.pauseUnity?.(false);
                    //sendUnityMessage("appLifecycle", "resume");
                }
 
                appState.current = nextAppState;
            };
            const subscription = AppState.addEventListener("change", handleAppStateChange);
            // @ts-ignore
            unityRef.current.postMessage("ReactNativeCommandHandler", "Handle", message)
 
            return () => {
                subscription.remove();
            };
        }
    }, []);
 
    function HandleUnityMessage(message: string) {
        console.log("Handlemessage", message);
        // Check if the message from the WebView indicates that it's ready
        if (message.includes("webviewReady") || message.includes("backToHomeScreen")) {
            if (unityRef.current) {
                //message to unity to set the home screen url
                let message = JSON.stringify({
                    type: "updateHomeScreenUrl",
                    message: "https://cdn.xensear.vn/frontend/3.2/homescreen.html"
                })
 
                // @ts-ignore
                unityRef.current.postMessage("ReactNativeCommandHandler", "Handle", message)
            }
        } else if (message.includes("getNativeParameters")) {
 
        }
        else if (message.includes("backToNativeView")) {
            if (unityRef.current) {
                // @ts-ignore
                unityRef.current.unloadUnity()
            }
            router.back();
        }
 
    }
 
    return (
 
        // If you wrap your UnityView inside a parent, please take care to set dimensions to it (with `flex:1` for example).
        // See the `Know issues` part in the README.
        <View style={{ flex: 1 }}>
            <UnityView
                // @ts-ignore
                ref={unityRef}
                style={{ flex: 1 }}
                onUnityMessage={(result: any) => HandleUnityMessage(result.nativeEvent.message)}
                fullScreen={false}
                androidKeepPlayerMounted={false}
            />
        </View>
    )
}
 
export default Unity

# Example: export JAVA_HOME='/Applications/Android Studio.app/Contents/jbr/Contents/Home'
export JAVA_HOME="<YOUR-JAVA-HOME-FOLDER>"
 
# Example: export ANDROID_HOME=/Users/xr/Library/Android/sdk
export ANDROID_HOME="<YOUR-ANDROID-SDK-FOLDER>"
 
cd "<REACT-NATIVE-ROOT-FOLDER>/android"
./gradlew assembleRelease
 
# connect to device
adb reconnect
 
# install to device
adb install "app/build/outputs/apk/release/app-release.apk"